16, 21, 26, 31, 36
just add five to each previous number to make it easier
Answer: 
Step-by-step explanation:
The answer is B because if there are 30 total and 12 are on 1 shelf, then 30-12=18
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∠1 and ∠2 are alternate exterior angles where transversal BE crosses parallel lines AC and DF, therefore they are equal. ∠2 and ∠3 are opposite angles of a parallelogram, therefore they are equal.
... ∠1 = ∠2
... 3x -5 = 2x +15 . . . . substitute the given values
... x = 20 . . . . . . . . . . . add 5-2x
The measures of angles 1, 2, and 3 are 2·20+15 = 55 . . . degrees.
